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1.1 root 1: /*
2: * Commpage syscalls
3: *
4: * Copyright (c) 2006 Pierre d'Herbemont
5: *
6: * This program is free software; you can redistribute it and/or modify
7: * it under the terms of the GNU General Public License as published by
8: * the Free Software Foundation; either version 2 of the License, or
9: * (at your option) any later version.
10: *
11: * This program is distributed in the hope that it will be useful,
12: * but WITHOUT ANY WARRANTY; without even the implied warranty of
13: * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14: * GNU General Public License for more details.
15: *
16: * You should have received a copy of the GNU General Public License
1.1.1.3 root 17: * along with this program; if not, see <http://www.gnu.org/licenses/>.
1.1 root 18: */
19: #include <fcntl.h>
20: #include <stdio.h>
21: #include <stdlib.h>
22: #include <errno.h>
23:
24: #include <mach/message.h>
25: #include <mach/mach.h>
26: #include <mach/mach_time.h>
27: #include <sys/time.h>
28: #include <sys/mman.h>
29: #include <libkern/OSAtomic.h>
30:
31: #include "qemu.h"
32:
33: //#define DEBUG_COMMPAGE
34:
35: #ifdef DEBUG_COMMPAGE
1.1.1.2 root 36: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); printf(__VA_ARGS__); } while(0)
1.1 root 37: #else
1.1.1.2 root 38: # define DPRINTF(...) do { qemu_log(__VA_ARGS__); } while(0)
1.1 root 39: #endif
40:
41: /********************************************************************
42: * Commpage definitions
43: */
44: #ifdef TARGET_I386
45: /* Reserve space for the commpage see xnu/osfmk/i386/cpu_capabilities.h */
46: # define COMMPAGE_START (-16 * 4096) /* base address is -20 * 4096 */
47: # define COMMPAGE_SIZE (0x1240) /* _COMM_PAGE_AREA_LENGTH is 19 * 4096 */
48: #elif defined(TARGET_PPC)
49: /* Reserve space for the commpage see xnu/osfmk/ppc/cpu_capabilities.h */
50: # define COMMPAGE_START (-8*4096)
51: # define COMMPAGE_SIZE (2*4096) /* its _COMM_PAGE_AREA_USED but _COMM_PAGE_AREA_LENGTH is 7*4096 */
52: #endif
53:
54: void do_compare_and_swap32(void *cpu_env, int num);
55: void do_compare_and_swap64(void *cpu_env, int num);
56: void do_add_atomic_word32(void *cpu_env, int num);
57: void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1);
58: void do_nanotime(void *cpu_env, int num);
59:
60: void unimpl_commpage(void *cpu_env, int num);
61:
62: typedef void (*commpage_8args_function_t)(uint32_t arg1, uint32_t arg2, uint32_t arg3,
63: uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
64: uint32_t arg8);
65: typedef void (*commpage_indirect_function_t)(void *cpu_env, int num, uint32_t arg1,
66: uint32_t arg2, uint32_t arg3, uint32_t arg4, uint32_t arg5,
67: uint32_t arg6, uint32_t arg7, uint32_t arg8);
68:
69: #define HAS_PTR 0x10
70: #define NO_PTR 0x20
71: #define CALL_DIRECT 0x1
72: #define CALL_INDIRECT 0x2
73:
74: #define COMMPAGE_ENTRY(name, nargs, offset, func, options) \
75: { #name, offset, nargs, options, (commpage_8args_function_t)func }
76:
77: struct commpage_entry {
78: char * name;
79: int offset;
80: int nargs;
81: char options;
82: commpage_8args_function_t function;
83: };
84:
85: static inline int commpage_code_num(struct commpage_entry *entry)
86: {
87: if((entry->options & HAS_PTR))
88: return entry->offset + 4;
89: else
90: return entry->offset;
91: }
92:
93: static inline int commpage_is_indirect(struct commpage_entry *entry)
94: {
95: return !(entry->options & CALL_DIRECT);
96: }
97:
98: /********************************************************************
99: * Commpage entry
100: */
101: static struct commpage_entry commpage_entries[] =
102: {
103: COMMPAGE_ENTRY(compare_and_swap32, 0, 0x080, do_compare_and_swap32, CALL_INDIRECT | HAS_PTR),
104: COMMPAGE_ENTRY(compare_and_swap64, 0, 0x0c0, do_compare_and_swap64, CALL_INDIRECT | HAS_PTR),
105: COMMPAGE_ENTRY(enqueue, 0, 0x100, unimpl_commpage, CALL_INDIRECT),
106: COMMPAGE_ENTRY(dequeue, 0, 0x140, unimpl_commpage, CALL_INDIRECT),
107: COMMPAGE_ENTRY(memory_barrier, 0, 0x180, unimpl_commpage, CALL_INDIRECT),
108: COMMPAGE_ENTRY(add_atomic_word32, 0, 0x1a0, do_add_atomic_word32, CALL_INDIRECT | HAS_PTR),
109: COMMPAGE_ENTRY(add_atomic_word64, 0, 0x1c0, unimpl_commpage, CALL_INDIRECT | HAS_PTR),
110:
111: COMMPAGE_ENTRY(mach_absolute_time, 0, 0x200, unimpl_commpage, CALL_INDIRECT),
112: COMMPAGE_ENTRY(spinlock_try, 1, 0x220, unimpl_commpage, CALL_INDIRECT),
113: COMMPAGE_ENTRY(spinlock_lock, 1, 0x260, OSSpinLockLock, CALL_DIRECT),
114: COMMPAGE_ENTRY(spinlock_unlock, 1, 0x2a0, OSSpinLockUnlock, CALL_DIRECT),
115: COMMPAGE_ENTRY(pthread_getspecific, 0, 0x2c0, unimpl_commpage, CALL_INDIRECT),
116: COMMPAGE_ENTRY(gettimeofday, 1, 0x2e0, do_cgettimeofday, CALL_INDIRECT),
117: COMMPAGE_ENTRY(sys_dcache_flush, 0, 0x4e0, unimpl_commpage, CALL_INDIRECT),
118: COMMPAGE_ENTRY(sys_icache_invalidate, 0, 0x520, unimpl_commpage, CALL_INDIRECT),
119: COMMPAGE_ENTRY(pthread_self, 0, 0x580, unimpl_commpage, CALL_INDIRECT),
120:
121: COMMPAGE_ENTRY(relinquish, 0, 0x5c0, unimpl_commpage, CALL_INDIRECT),
122:
123: #ifdef TARGET_I386
124: COMMPAGE_ENTRY(bts, 0, 0x5e0, unimpl_commpage, CALL_INDIRECT),
125: COMMPAGE_ENTRY(btc, 0, 0x5f0, unimpl_commpage, CALL_INDIRECT),
126: #endif
127:
128: COMMPAGE_ENTRY(bzero, 2, 0x600, bzero, CALL_DIRECT),
129: COMMPAGE_ENTRY(bcopy, 3, 0x780, bcopy, CALL_DIRECT),
130: COMMPAGE_ENTRY(memcpy, 3, 0x7a0, memcpy, CALL_DIRECT),
131:
132: #ifdef TARGET_I386
133: COMMPAGE_ENTRY(old_nanotime, 0, 0xf80, do_nanotime, CALL_INDIRECT),
134: COMMPAGE_ENTRY(memset_pattern, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
135: COMMPAGE_ENTRY(long_copy, 0, 0x1200, unimpl_commpage, CALL_INDIRECT),
136:
137: COMMPAGE_ENTRY(sysintegrity, 0, 0x1600, unimpl_commpage, CALL_INDIRECT),
138:
139: COMMPAGE_ENTRY(nanotime, 0, 0x1700, do_nanotime, CALL_INDIRECT),
140: #elif TARGET_PPC
141: COMMPAGE_ENTRY(compare_and_swap32b, 0, 0xf80, unimpl_commpage, CALL_INDIRECT),
142: COMMPAGE_ENTRY(compare_and_swap64b, 0, 0xfc0, unimpl_commpage, CALL_INDIRECT),
143: COMMPAGE_ENTRY(memset_pattern, 0, 0x1000, unimpl_commpage, CALL_INDIRECT),
144: COMMPAGE_ENTRY(bigcopy, 0, 0x1140, unimpl_commpage, CALL_INDIRECT),
145: #endif
146: };
147:
148:
149: /********************************************************************
150: * Commpage backdoor
151: */
152: static inline void print_commpage_entry(struct commpage_entry entry)
153: {
154: printf("@0x%x %s\n", entry.offset, entry.name);
155: }
156:
157: static inline void install_commpage_backdoor_for_entry(struct commpage_entry entry)
158: {
159: #ifdef TARGET_I386
160: char * commpage = (char*)(COMMPAGE_START+entry.offset);
161: int c = 0;
162: if(entry.options & HAS_PTR)
163: {
164: commpage[c++] = (COMMPAGE_START+entry.offset+4) & 0xff;
165: commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 8) & 0xff;
166: commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 16) & 0xff;
167: commpage[c++] = ((COMMPAGE_START+entry.offset+4) >> 24) & 0xff;
168: }
169: commpage[c++] = 0xcd;
170: commpage[c++] = 0x79; /* int 0x79 */
171: commpage[c++] = 0xc3; /* ret */
172: #else
173: qerror("can't install the commpage on this arch\n");
174: #endif
175: }
176:
177: /********************************************************************
178: * Commpage initialization
179: */
180: void commpage_init(void)
181: {
1.1.1.2 root 182: #if (defined(__i386__) ^ defined(TARGET_I386)) || (defined(_ARCH_PPC) ^ defined(TARGET_PPC))
1.1 root 183: int i;
184: void * commpage = (void *)target_mmap( COMMPAGE_START, COMMPAGE_SIZE,
185: PROT_WRITE | PROT_READ, MAP_ANONYMOUS | MAP_FIXED, -1, 0);
186: if((int)commpage != COMMPAGE_START)
187: qerror("can't allocate the commpage\n");
188:
189: bzero(commpage, COMMPAGE_SIZE);
190:
191: /* XXX: commpage data not handled */
192:
1.1.1.2 root 193: for(i = 0; i < ARRAY_SIZE(commpage_entries); i++)
1.1 root 194: install_commpage_backdoor_for_entry(commpage_entries[i]);
195: #else
196: /* simply map our pages so they can be executed
197: XXX: we don't really want to do that since in the ppc on ppc situation we may
198: not able to run commpages host optimized instructions (like G5's on a G5),
199: hence this is sometimes a broken fix. */
200: page_set_flags(COMMPAGE_START, COMMPAGE_START+COMMPAGE_SIZE, PROT_EXEC | PROT_READ | PAGE_VALID);
201: #endif
202: }
203:
204: /********************************************************************
205: * Commpage implementation
206: */
207: void do_compare_and_swap32(void *cpu_env, int num)
208: {
209: #ifdef TARGET_I386
210: uint32_t old = ((CPUX86State*)cpu_env)->regs[R_EAX];
211: uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_ECX];
212: DPRINTF("commpage: compare_and_swap32(%x,new,%p)\n", old, value);
213:
214: if(value && old == tswap32(*value))
215: {
216: uint32_t new = ((CPUX86State*)cpu_env)->regs[R_EDX];
217: *value = tswap32(new);
218: /* set zf flag */
219: ((CPUX86State*)cpu_env)->eflags |= 0x40;
220: }
221: else
222: {
223: ((CPUX86State*)cpu_env)->regs[R_EAX] = tswap32(*value);
224: /* unset zf flag */
225: ((CPUX86State*)cpu_env)->eflags &= ~0x40;
226: }
227: #else
228: qerror("do_compare_and_swap32 unimplemented");
229: #endif
230: }
231:
232: void do_compare_and_swap64(void *cpu_env, int num)
233: {
234: #ifdef TARGET_I386
235: /* OSAtomicCompareAndSwap64 is not available on non 64 bits ppc, here is a raw implementation */
236: uint64_t old, new, swapped_val;
237: uint64_t *value = (uint64_t*)((CPUX86State*)cpu_env)->regs[R_ESI];
238: old = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_EDX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EAX];
239:
1.1.1.4 ! root 240: DPRINTF("commpage: compare_and_swap64(%" PRIx64 ",new,%p)\n", old, value);
1.1 root 241: swapped_val = tswap64(*value);
242:
243: if(old == swapped_val)
244: {
245: new = (uint64_t)((uint64_t)((CPUX86State*)cpu_env)->regs[R_ECX]) << 32 | (uint64_t)((CPUX86State*)cpu_env)->regs[R_EBX];
246: *value = tswap64(new);
247: /* set zf flag */
248: ((CPUX86State*)cpu_env)->eflags |= 0x40;
249: }
250: else
251: {
252: ((CPUX86State*)cpu_env)->regs[R_EAX] = (uint32_t)(swapped_val);
253: ((CPUX86State*)cpu_env)->regs[R_EDX] = (uint32_t)(swapped_val >> 32);
254: /* unset zf flag */
255: ((CPUX86State*)cpu_env)->eflags &= ~0x40;
256: }
257: #else
258: qerror("do_compare_and_swap64 unimplemented");
259: #endif
260: }
261:
262: void do_add_atomic_word32(void *cpu_env, int num)
263: {
264: #ifdef TARGET_I386
265: uint32_t amt = ((CPUX86State*)cpu_env)->regs[R_EAX];
266: uint32_t *value = (uint32_t*)((CPUX86State*)cpu_env)->regs[R_EDX];
267: uint32_t swapped_value = tswap32(*value);
268:
269: DPRINTF("commpage: add_atomic_word32(%x,%p)\n", amt, value);
270:
271: /* old value in EAX */
272: ((CPUX86State*)cpu_env)->regs[R_EAX] = swapped_value;
273: *value = tswap32(swapped_value + amt);
274: #else
275: qerror("do_add_atomic_word32 unimplemented");
276: #endif
277: }
278:
279: void do_cgettimeofday(void *cpu_env, int num, uint32_t arg1)
280: {
281: #ifdef TARGET_I386
282: extern int __commpage_gettimeofday(struct timeval *);
283: DPRINTF("commpage: gettimeofday(0x%x)\n", arg1);
284: struct timeval *time = (struct timeval *)arg1;
285: int ret = __commpage_gettimeofday(time);
286: tswap32s((uint32_t*)&time->tv_sec);
287: tswap32s((uint32_t*)&time->tv_usec);
288: ((CPUX86State*)cpu_env)->regs[R_EAX] = ret; /* Success */
289: #else
290: qerror("do_gettimeofday unimplemented");
291: #endif
292: }
293:
294: void do_nanotime(void *cpu_env, int num)
295: {
296: #ifdef TARGET_I386
297: uint64_t t = mach_absolute_time();
298: ((CPUX86State*)cpu_env)->regs[R_EAX] = (int)(t & 0xffffffff);
299: ((CPUX86State*)cpu_env)->regs[R_EDX] = (int)((t >> 32) & 0xffffffff);
300: #else
301: qerror("do_nanotime unimplemented");
302: #endif
303: }
304:
305: void unimpl_commpage(void *cpu_env, int num)
306: {
307: qerror("qemu: commpage function 0x%x not implemented\n", num);
308: }
309:
310: /********************************************************************
311: * do_commpage - called by the main cpu loop
312: */
313: void
314: do_commpage(void *cpu_env, int num, uint32_t arg1, uint32_t arg2, uint32_t arg3,
315: uint32_t arg4, uint32_t arg5, uint32_t arg6, uint32_t arg7,
316: uint32_t arg8)
317: {
318: int i, found = 0;
319:
320: arg1 = tswap32(arg1);
321: arg2 = tswap32(arg2);
322: arg3 = tswap32(arg3);
323: arg4 = tswap32(arg4);
324: arg5 = tswap32(arg5);
325: arg6 = tswap32(arg6);
326: arg7 = tswap32(arg7);
327: arg8 = tswap32(arg8);
328:
329: num = num-COMMPAGE_START-2;
330:
1.1.1.2 root 331: for(i = 0; i < ARRAY_SIZE(commpage_entries); i++) {
1.1 root 332: if( num == commpage_code_num(&commpage_entries[i]) )
333: {
334: DPRINTF("commpage: %s %s\n", commpage_entries[i].name, commpage_is_indirect(&commpage_entries[i]) ? "[indirect]" : "[direct]");
335: found = 1;
336: if(commpage_is_indirect(&commpage_entries[i]))
337: {
338: commpage_indirect_function_t function = (commpage_indirect_function_t)commpage_entries[i].function;
339: function(cpu_env, num, arg1, arg2, arg3,
340: arg4, arg5, arg6, arg7, arg8);
341: }
342: else
343: {
344: commpage_entries[i].function(arg1, arg2, arg3,
345: arg4, arg5, arg6, arg7, arg8);
346: }
347: break;
348: }
349: }
350:
351: if(!found)
352: {
353: gemu_log("qemu: commpage function 0x%x not defined\n", num);
354: gdb_handlesig (cpu_env, SIGTRAP);
355: exit(-1);
356: }
357: }
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